<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <h2>{{message}}</h2>
    <h2 v-once>{{message}}</h2>
</div>


<script src="../../js/vue.js"></script>

<script>
    const vue = new Vue({
        el: "#app",
        data: {
            message: "Hello vue,你好！"
        }
    });
</script>

</body>
</html>